Hi Bob - its definitely an Oberndorf Mauserwerke. I thought the variation in methods of stock markings was interesting too, but am told that pencil or even ink made serial no's are recognised in dsm-34's.perhaps your dsm34 is not Mauser made?
My mauser DSM-34 has the serial # stamped in the stock's channel & un-numbered handguard..I checked them today. Sorry..must have got the numbering confused with the Gustloff KKW I had.308nutt -- perhaps your dsm34 is not Mauser made? If it is Mauser made, I would expect a stamper serial in the channel...